org.tigris.subversion.svnclientadapter.SVNClientException: Javahl client
adapter is not available
at
org.tigris.subversion.svnclientadapter.javahl.JhlClientAdapterFactory.setup(JhlClientAdapterFactory.java:48)
at
org.tigris.subversion.subclipse.core.SVNClientManager.startup(SVNClientManager.java:40)

which means nothing. When you look at the setup() method, you'll see
that the code throws away the exception which would tell *why* the
shared library can't be loaded (missing symbol, library not in path, etc).

Can you please pass this exception on, for heaveans sake? As it is,
finding out why Eclipse cannot load the library is a major pain :-(

It would be just five minutes of work to fix the code and it would stop
wasting the time of countless people who have to try ten things to
figure out what the problem might be.